Electronic pen including core structure, and electronic device including same

Abstract

An electronic device is provided. The electronic device includes a housing and an electronic pen detachable from the housing, wherein the electronic pen includes a case, a pen tip disposed at one end of the case and protruded from the one end to an outside of the case, a rod extending from the pen tip into an inside of the case, a core including a first portion facing the one end of the case and including a first material, a second portion contacting the first portion and including a second material, and a through-hole penetrating the first and second portions and accommodating at least a portion of the rod, and a conductive coil surrounding at least a portion of the second portion, wherein a magnetic flux density of the first material is greater than a magnetic flux density of the second material.

What is claimed is: 
     
         1 . An electronic device comprising:
 a housing; and   an electronic pen detachable from the housing,   wherein the electronic pen includes:
 a case, 
 a pen tip, disposed at one end of the case, protruded from the one end to an outside of the case, 
 a rod extending from the pen tip into an inside of the case, 
 a core including:
 a first portion, facing the one end of the case, comprising a first material, 
 a second portion, contacting the first portion, comprising a second material, and 
 a through hole, penetrating the first and second portions, accommodating at least a portion of the rod, and 
 
 a conductive coil surrounding at least a portion of the second portion, and 
   wherein a magnetic flux density of the first material is greater than a magnetic flux density of the second material.   
     
     
         2 . The electronic device of  claim 1  further comprising:
 a display including an electromagnetic induction panel electrically interacting with the electronic pen; and 
 a processor configured to obtain input information from an electronic interaction between the electronic pen and the electromagnetic induction panel. 
 
     
     
         3 . The electronic device of  claim 2 , further comprising:
 a magnet, disposed between the display and the housing, facing a lateral side of the housing.   
     
     
         4 . The electronic device of  claim 1 , wherein the case includes:
 a flat region extending in a longitudinal direction of the electronic pen, and   a curved region, extending from the flat region, defining an inside of the case together with the flat region.   
     
     
         5 . The electronic device of  claim 1 , wherein one cross section of the case has a track shape of which a length of a major axis is longer than a length of a minor axis. 
     
     
         6 . The electronic device of  claim 5 , wherein the length of the minor axis of the one cross section is smaller than a length corresponding to a thickness of a lateral side of the housing. 
     
     
         7 . The electronic device of  claim 5 , wherein the core has a track shape corresponding to the one cross section of the case to be disposed within the case. 
     
     
         8 . The electronic device of  claim 1 ,
 wherein the housing includes:
 a first housing including a first surface and a second surface opposite to the first surface, and 
 a second housing including a third surface and a fourth surface opposite to the third surface, and 
   wherein the electronic device further comprises:
 a hinge structure configured to provide a folded state in which the first surface and the third surface are facing each other or an unfolded state in which a direction toward which the first surface faces is corresponding to a direction toward which the third surface faces by rotatably coupling the first housing and the second housing, and 
 a flexible display, across the hinge structure, disposed on the first surface and the third surface. 
   
     
     
         9 . The electronic device of  claim 8 , further comprising:
 a first magnet disposed between the first surface and the second surface; and   a second magnet, disposed between the third surface and the fourth surface, facing the first magnet in the folded state,   wherein the first magnet is configured to maintain the folded state by having different polarity from the second magnet.   
     
     
         10 . The electronic device of  claim 1 ,
 wherein the electronic pen further includes:
 a printed circuit board, and 
 a resonance circuit, disposed on the printed circuit board, including a variable capacitor, and 
   wherein the variable capacitor is configured to change capacitance of the resonance circuit when the rod moves in a first direction as the pen tip is pressed or when the rod moves in a second direction opposite to the first direction as pressure is released.   
     
     
         11 . The electronic device of  claim 10 ,
 wherein the first portion of the core includes a first region protruded in the second direction with respect to the conductive coil, and   wherein the second portion of the core includes a second region protruded in the first direction with respect to the conductive coil.   
     
     
         12 . The electronic device of  claim 1 , wherein the pen tip and the rod comprise a conductive material. 
     
     
         13 . The electronic device of  claim 1 ,
 wherein the first material comprises metal powders, and   wherein the second material comprises ferrite.   
     
     
         14 . The electronic device of  claim 1 , wherein magnetic permeability of the first material is smaller than magnetic permeability of the second material. 
     
     
         15 . The electronic device of  claim 1 , wherein the conductive coil further surrounds at least a portion of the first portion. 
     
     
         16 . An electronic pen comprising:
 a case;   a pen tip, disposed at one end of the case, protruded from the one end to an outside of the case;   a rod extending from the pen tip into an inside of the case;   a core including:
 a first portion, facing the one end of the case, comprising a first material, 
 a second portion, contacting the first portion, comprising a second material, and 
 a through hole, penetrating the first and second portions, accommodating at least a portion of the rod; and 
   a conductive coil surrounding at least a portion of the second portion,   wherein a magnetic flux density of the first material is greater than a magnetic flux density of the second material.   
     
     
         17 . The electronic pen of  claim 16 , further comprising:
 a printed circuit board; and   a resonance circuit, disposed on the printed circuit board, including a variable capacitor,   wherein the variable capacitor is configured to change a capacitance of the resonance circuit when the pen tip moves in a first direction as the pen tip pressed or when the pen tip moves in a second direction opposite to the first direction as pressure is released.   
     
     
         18 . The electronic pen of  claim 17 ,
 wherein the first portion of the core includes a first region protruded toward the second direction with respect to the conductive coil, and   wherein the second portion of the core includes a second region protruded toward the first direction with respect to the conductive coil.   
     
     
         19 . The electronic pen of  claim 16 , wherein the pen tip and the rod comprise conductive material. 
     
     
         20 . The electronic pen of  claim 16 ,
 wherein the first material comprises metal powders, and   wherein the second material comprises ferrite.